Send a part number, a photo, or a whole BOM — we supply it and stand behind it. Worldwide shipping to 80+ countries.

3G Electric
SIEMENS IEC 5SY42255 A-Curve 2-Pole UL1077 Supplementary Protector - A-Curve, 2-Pole UL1077 DIN Rail-Mount Supplementary Protectors
SIEMENS IECA-Curve, 2-Pole UL1077 DIN Rail-Mount Supplementary Protectors

SIEMENS IEC 5SY42255 A-Curve 2-Pole UL1077 Supplementary Protector

The SIEMENS IEC Supplementary Protector (SKU 5SY42255, MPN 5SY42255) is a 25 A, A-Curve, 2-Pole UL1077 DIN Rail-Mount supplementary protector from the 5SY4 series. It features a screw-clamp connection and is rated at…

SKU 3G-OTH-127909

Brand
SIEMENS IEC
Item
5SY42255 A-Curve 2-Pole UL1077 Supplementary Protector
Part Number
5SY42255
Category
A-Curve, 2-Pole UL1077 DIN Rail-Mount Supplementary Protectors
Available to Order
Also known as:5SY42255SIEMENS IEC
Trade pricing by quote — replies within 24h
Qty
WhatsApp an engineerMessage via Telegram
No account needed — your quote request goes straight to our engineers. A free account lets you track quotes and re-order faster.
Worldwide Shipping
Air & sea freight
Datasheet on Request
Technical specs
1-Day Quote
Replies within 24h

Local availability & support — Singapore

Local office
20 Woodlands Link #09-05, Singapore 738733
Phone
+65 8878 8355
Delivery
Same-day or next-business-day delivery within Singapore for in-stock items; 7–14 days for factory-order parts from Europe.
Payment
Invoicing in SGD. PayNow, bank transfer, and corporate PO accepted.
Ships to
Singapore

Technical Specifications

SIEMENS IEC
Manufacturer Part Number
5SY42255
Type
10kA at 400V AC, Screw Clamp, 5SY4
AC
400V
DC
72V

Technical Documents

No technical documents available for this product.
Request documentation
Not sure this is the right part? Get a recommendation.

Need installation or engineering help?

Installation, commissioning, maintenance plans, system design, and bundled product + service quotes — one team handles the full scope.
Talk to an engineer

Ask a question

SIEMENS IEC Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The SIEMENS IEC Supplementary Protector (SKU 5SY42255, MPN 5SY42255) is a 25 A, A-Curve, 2-Pole UL1077 DIN Rail-Mount supplementary protector from the 5SY4 series. It features a screw-clamp connection and is rated at 400V AC with a breaking capacity of 10kA at 400V AC, and 72V DC.

Frequently Asked Questions

What is the SIEMENS IEC Supplementary Protector 5SY42255 used for?

The SIEMENS IEC Supplementary Protector 5SY42255 is used to protect branch circuits and equipment from overcurrent and short circuits in industrial control panels, HVAC systems, and automation applications. It is a UL1077 listed, DIN rail-mount device suitable for 400V AC and 72V DC systems.

What are the specifications of the SIEMENS 5SY42255 supplementary protector?

The SIEMENS 5SY42255 is a 25 A, A-Curve, 2-pole supplementary protector from the 5SY4 series. It has a screw-clamp connection, rated voltage of 400V AC and 72V DC, and a breaking capacity of 10kA at 400V AC. It is UL1077 listed for DIN rail mounting.

Where to buy the SIEMENS 5SY42255 supplementary protector worldwide?

You can source the SIEMENS 5SY42255 supplementary protector worldwide through 3G Electric, a global industrial equipment distributor. We handle full logistics, customs clearance, and delivery to your location. Contact us for availability and lead time.

How to install the SIEMENS 5SY42255 supplementary protector?

To install the SIEMENS 5SY42255, mount it on a standard DIN rail, ensure the circuit is de-energized, and connect wires using the screw-clamp terminals. Follow the manufacturer's torque specifications and verify polarity for DC applications. Always consult local electrical codes.

Used in

Common applications for SIEMENS IEC
Motor control centers — Siemens 5SY4 D-curve supplementary protectors (e.g., 5SY42108) for motor branch circuit protection
HVAC equipment — A-curve protectors (e.g., 5SY42255) for compressor and fan motor overcurrent protection
Industrial conveyor systems — 4-pole D-curve protectors (e.g., 5SY44168) for three-phase motor protection with neutral
Pump control panels — 2-pole supplementary protectors (e.g., 5SY42038) for single-phase pump motor protection
Machine tool control circuits — A-curve protectors (e.g., 5SY44155) for solenoid valve and relay protection
Power distribution sub-panels — 4-pole protectors (e.g., 5SY44155) for three-phase branch circuit protection in light industrial settings
Not sure this is the right part? Photo-identify it

SIEMENS IEC Products

3G Electric supplies SIEMENS IEC a-curve, 2-pole ul1077 din rail-mount supplementary protectors. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

You might also need

Burners & Combustion Pumps & Compressors Spare Parts All Products

More from SIEMENS IEC

View all SIEMENS IEC parts
This 16 A, A-Curve, 2-pole supplementary protector from the 5SY4 series is rated for 400V AC with a breaking capacity of 10kA at 400V AC and 72V DC. It features screw clamp terminals and mounts on a standard DIN rail. Suitable for overcurrent and short-circuit protection in branch circuits and equipment within industrial control panels, HVAC systems, and automation applications
SIEMENS IEC
This 16 A, A-Curve, 2-pole supplementary protector from the 5SY4 series is rated for 400V AC with a breaking capacity of 10kA at 400V AC and 72V DC. It features screw clamp terminals and mounts on a standard DIN rail. Suitable for overcurrent and short-circuit protection in branch circuits and equipment within industrial control panels, HVAC systems, and automation applications

Customer reviews

No reviews yet — be the first

Questions & answers

No questions yet — ask us the first